High pitched whining noise everyone has been complaining about, starts at 2000 and goes up to 3500, but really comes to full annoyonce at 3k. It does not occur in neutral, only while in gear during normal acceleration (quietly under slight acceleration and not at all when smashing the gas). I removed the exhaust header heat shield, mystery noise persisted. Checked the cat heat shield, and its in perfect shape. I checked the half-shaft shield, to find it was non-existent. There was a small shield next to the firewall, on the drivers side, that appeared hitting the brake lines, not it either. I have also adjusted the hood stops so that's not the issue. The noise comes from the drivers side. I have discovered that the noise gets louder as the engine warms up, pointing to a timing chain tensioner. I have also discovered that the drivers side axle has a little bit of play before the wheel starts spinning, suggesting a bad bearing . In the interest of my wallet how can I check the timing chain tensioner, and if it is a bad bearing, do I need to replace the wheel bearing, or can I, and would it be easier to just replace the drivers side axle. Any other thoughts as to what it could be would be appreciated as well.